Interesting that those double vaccinated won't need to quarantine now on return from an amber country and neither will under 18s travelling with vaccinated parents.
This means that our single vaccinated son who is 18 would need to self-isolate for 10 days, whilst his 15 year old sister and parents don't have to. I know they are the rules but that is slightly bizarre as we will have been together. I assume other 19/20 year olds who could be travelling as part of a family group could be in the same situation.